<div id="gioithieu">
	<div id="tieude_1">
    	<p>Giới thiệu</p>
    </div>
	<div id="noidung_gt">
		<?php 
			$sql=$mysqli->query("select * from gioithieu ");
			while ($row=$sql->fetch_array()){
				echo $row['NOIDUNG_GT'];
			}
		?>
	</div>
</div>